package com.pb.infra.oth.util;

/**
 * 中国农历算法 - 实用于公历 1901 年至 2100 年之间的 200 年
 * @author 沈星浩
 * @date 2020年5月21日
 */
public class ChineseCalendarGB {
    private int gregorianYear;
    private int gregorianMonth;
    private int gregorianDate;
    private boolean isGregorianLeap;
    private int dayOfYear;
    private int dayOfWeek; // 周日一星期的第一天
    private int chineseYear;
    private int chineseMonth; // 负数表示闰月
    private int chineseDate;
    private int sectionalTerm;
    private int principleTerm;
    private static ChineseCalendarGB chineseCalendarGB = new ChineseCalendarGB();
    private static char[] daysInGregorianMonth =
            {31,28,31,30,31,30,31,31,30,31,30,31};
    private static String[] stemNames =
            {"甲","乙","丙","丁","戊","己","庚","辛","壬","癸"};
    private static String[] branchNames =
            {"子","丑","寅","卯","辰","巳","午","未","申","酉","戌","亥"};
    private static String[] animalNames =
            {"鼠","牛","虎","兔","龙","蛇","马","羊","猴","鸡","狗","猪"};
    public static void main(String[] arg) {
        ChineseCalendarGB c = new ChineseCalendarGB();
        String cmd = "day";
        int y = 2014;
        int m = 4;
        int d = 5;
//	      if (arg.length>0) cmd = arg[0];
//	      if (arg.length>1) y = Integer.parseInt(arg[1]);
//	      if (arg.length>2) m = Integer.parseInt(arg[2]);
//	      if (arg.length>3) d = Integer.parseInt(arg[3]);
        c.setGregorian(y,m,d);
        c.computeChineseFields();
        c.computeSolarTerms();
        if (cmd.equalsIgnoreCase("year")) {
            String[] t = c.getYearTable();
            for (int i=0; i<t.length; i++) ;
        } else if (cmd.equalsIgnoreCase("month")) {
            String[] t = c.getMonthTable();
            for (int i=0; i<t.length; i++) ;
        } else {

        }
    }

    public static ChineseCalendarGB getChineseCalendarGB(int year, int month , int day){

        chineseCalendarGB.setGregorian(year,month,day);
        chineseCalendarGB.computeChineseFields();
        chineseCalendarGB.computeSolarTerms();
        return chineseCalendarGB;
    }
    private ChineseCalendarGB() {
        setGregorian(1901,1,1);
    }
    public void setGregorian(int y, int m, int d) {
        gregorianYear = y;
        gregorianMonth = m;
        gregorianDate = d;
        isGregorianLeap = isGregorianLeapYear(y);
        dayOfYear = dayOfYear(y,m,d);
        dayOfWeek = dayOfWeek(y,m,d);
        chineseYear = 0;
        chineseMonth = 0;
        chineseDate = 0;
        sectionalTerm = 0;
        principleTerm = 0;
    }
    public static boolean isGregorianLeapYear(int year) {
        boolean isLeap = false;
        if (year%4==0) isLeap = true;
        if (year%100==0) isLeap = false;
        if (year%400==0) isLeap = true;
        return isLeap;
    }
    public static int daysInGregorianMonth(int y, int m) {
        int d = daysInGregorianMonth[m-1];
        if (m==2 && isGregorianLeapYear(y)) d++; // 公历闰年二月多一天
        return d;
    }
    public static int dayOfYear(int y, int m, int d) {
        int c = 0;
        for (int i=1; i<m; i++) {
            c = c + daysInGregorianMonth(y,i);
        }
        c = c + d;
        return c;
    }
    public static int dayOfWeek(int y, int m, int d) {
        int w = 1; // 公历一年一月一日是星期一，所以起始值为星期日
        y = (y-1)%400 + 1; // 公历星期值分部 400 年循环一次
        int ly = (y-1)/4; // 闰年次数
        ly = ly - (y-1)/100;
        ly = ly + (y-1)/400;
        int ry = y - 1 - ly; // 常年次数
        w = w + ry; // 常年星期值增一
        w = w + 2*ly; // 闰年星期值增二
        w = w + dayOfYear(y,m,d);
        w = (w-1)%7 + 1;
        return w;
    }
    private static char[] chineseMonths = {
            // 农历月份大小压缩表，两个字节表示一年。两个字节共十六个二进制位数，
            // 前四个位数表示闰月月份，后十二个位数表示十二个农历月份的大小。
            0x00,0x04,0xad,0x08,0x5a,0x01,0xd5,0x54,0xb4,0x09,0x64,0x05,0x59,0x45,
            0x95,0x0a,0xa6,0x04,0x55,0x24,0xad,0x08,0x5a,0x62,0xda,0x04,0xb4,0x05,
            0xb4,0x55,0x52,0x0d,0x94,0x0a,0x4a,0x2a,0x56,0x02,0x6d,0x71,0x6d,0x01,
            0xda,0x02,0xd2,0x52,0xa9,0x05,0x49,0x0d,0x2a,0x45,0x2b,0x09,0x56,0x01,
            0xb5,0x20,0x6d,0x01,0x59,0x69,0xd4,0x0a,0xa8,0x05,0xa9,0x56,0xa5,0x04,
            0x2b,0x09,0x9e,0x38,0xb6,0x08,0xec,0x74,0x6c,0x05,0xd4,0x0a,0xe4,0x6a,
            0x52,0x05,0x95,0x0a,0x5a,0x42,0x5b,0x04,0xb6,0x04,0xb4,0x22,0x6a,0x05,
            0x52,0x75,0xc9,0x0a,0x52,0x05,0x35,0x55,0x4d,0x0a,0x5a,0x02,0x5d,0x31,
            0xb5,0x02,0x6a,0x8a,0x68,0x05,0xa9,0x0a,0x8a,0x6a,0x2a,0x05,0x2d,0x09,
            0xaa,0x48,0x5a,0x01,0xb5,0x09,0xb0,0x39,0x64,0x05,0x25,0x75,0x95,0x0a,
            0x96,0x04,0x4d,0x54,0xad,0x04,0xda,0x04,0xd4,0x44,0xb4,0x05,0x54,0x85,
            0x52,0x0d,0x92,0x0a,0x56,0x6a,0x56,0x02,0x6d,0x02,0x6a,0x41,0xda,0x02,
            0xb2,0xa1,0xa9,0x05,0x49,0x0d,0x0a,0x6d,0x2a,0x09,0x56,0x01,0xad,0x50,
            0x6d,0x01,0xd9,0x02,0xd1,0x3a,0xa8,0x05,0x29,0x85,0xa5,0x0c,0x2a,0x09,
            0x96,0x54,0xb6,0x08,0x6c,0x09,0x64,0x45,0xd4,0x0a,0xa4,0x05,0x51,0x25,
            0x95,0x0a,0x2a,0x72,0x5b,0x04,0xb6,0x04,0xac,0x52,0x6a,0x05,0xd2,0x0a,
            0xa2,0x4a,0x4a,0x05,0x55,0x94,0x2d,0x0a,0x5a,0x02,0x75,0x61,0xb5,0x02,
            0x6a,0x03,0x61,0x45,0xa9,0x0a,0x4a,0x05,0x25,0x25,0x2d,0x09,0x9a,0x68,
            0xda,0x08,0xb4,0x09,0xa8,0x59,0x54,0x03,0xa5,0x0a,0x91,0x3a,0x96,0x04,
            0xad,0xb0,0xad,0x04,0xda,0x04,0xf4,0x62,0xb4,0x05,0x54,0x0b,0x44,0x5d,
            0x52,0x0a,0x95,0x04,0x55,0x22,0x6d,0x02,0x5a,0x71,0xda,0x02,0xaa,0x05,
            0xb2,0x55,0x49,0x0b,0x4a,0x0a,0x2d,0x39,0x36,0x01,0x6d,0x80,0x6d,0x01,
            0xd9,0x02,0xe9,0x6a,0xa8,0x05,0x29,0x0b,0x9a,0x4c,0xaa,0x08,0xb6,0x08,
            0xb4,0x38,0x6c,0x09,0x54,0x75,0xd4,0x0a,0xa4,0x05,0x45,0x55,0x95,0x0a,
            0x9a,0x04,0x55,0x44,0xb5,0x04,0x6a,0x82,0x6a,0x05,0xd2,0x0a,0x92,0x6a,
            0x4a,0x05,0x55,0x0a,0x2a,0x4a,0x5a,0x02,0xb5,0x02,0xb2,0x31,0x69,0x03,
            0x31,0x73,0xa9,0x0a,0x4a,0x05,0x2d,0x55,0x2d,0x09,0x5a,0x01,0xd5,0x48,
            0xb4,0x09,0x68,0x89,0x54,0x0b,0xa4,0x0a,0xa5,0x6a,0x95,0x04,0xad,0x08,
            0x6a,0x44,0xda,0x04,0x74,0x05,0xb0,0x25,0x54,0x03
    };
    // 初始日，公历农历对应日期：
    // 公历 1901 年 1 月 1 日，对应农历 4598 年 11 月 11 日
    private static int baseYear = 1901;
    private static int baseMonth = 1;
    private static int baseDate = 1;
    private static int baseIndex = 0;
    private static int baseChineseYear = 4598-1;
    private static int baseChineseMonth = 11;
    private static int baseChineseDate = 11;
    public int computeChineseFields() {
        if (gregorianYear<1901 || gregorianYear>2100) return 1;
        int startYear = baseYear;
        int startMonth = baseMonth;
        int startDate = baseDate;
        chineseYear = baseChineseYear;
        chineseMonth = baseChineseMonth;
        chineseDate = baseChineseDate;
        // 第二个对应日，用以提高计算效率
        // 公历 2000 年 1 月 1 日，对应农历 4697 年 11 月 25 日
        if (gregorianYear >= 2000) {
            startYear = baseYear + 99;
            startMonth = 1;
            startDate = 1;
            chineseYear = baseChineseYear + 99;
            chineseMonth = 11;
            chineseDate = 25;
        }
        int daysDiff = 0;
        for (int i=startYear; i<gregorianYear; i++) {
            daysDiff += 365;
            if (isGregorianLeapYear(i)) daysDiff += 1; // leap year
        }
        for (int i=startMonth; i<gregorianMonth; i++) {
            daysDiff += daysInGregorianMonth(gregorianYear,i);
        }
        daysDiff += gregorianDate - startDate;

        chineseDate += daysDiff;
        int lastDate = daysInChineseMonth(chineseYear, chineseMonth);
        int nextMonth = nextChineseMonth(chineseYear, chineseMonth);
        while (chineseDate>lastDate) {
            if (Math.abs(nextMonth)<Math.abs(chineseMonth)) chineseYear++;
            chineseMonth = nextMonth;
            chineseDate -= lastDate;
            lastDate = daysInChineseMonth(chineseYear, chineseMonth);
            nextMonth = nextChineseMonth(chineseYear, chineseMonth);
        }
        return 0;
    }
    private static int[] bigLeapMonthYears = {
            // 大闰月的闰年年份
            6, 14, 19, 25, 33, 36, 38, 41, 44, 52,
            55, 79,117,136,147,150,155,158,185,193
    };
    public static int daysInChineseMonth(int y, int m) {
        // 注意：闰月 m < 0
        int index = y - baseChineseYear + baseIndex;
        int v = 0;
        int l = 0;
        int d = 30;
        if (1<=m && m<=8) {
            v = chineseMonths[2*index];
            l = m - 1;
            if ( ((v>>l)&0x01)==1 ) d = 29;
        } else if (9<=m && m<=12) {
            v = chineseMonths[2*index+1];
            l = m - 9;
            if ( ((v>>l)&0x01)==1 ) d = 29;
        } else {
            v = chineseMonths[2*index+1];
            v = (v>>4)&0x0F;
            if (v!=Math.abs(m)) {
                d = 0;
            } else {
                d = 29;
                for (int i=0; i<bigLeapMonthYears.length; i++) {
                    if (bigLeapMonthYears[i]==index) {
                        d = 30;
                        break;
                    }
                }
            }
        }
        return d;
    }
    public static int nextChineseMonth(int y, int m) {
        int n = Math.abs(m) + 1;
        if (m>0) {
            int index = y - baseChineseYear + baseIndex;
            int v = chineseMonths[2*index+1];
            v = (v>>4)&0x0F;
            if (v==m) n = -m;
        }
        if (n==13) n = 1;
        return n;
    }
    private static char[][] sectionalTermMap = {
            {7,6,6,6,6,6,6,6,6,5,6,6,6,5,5,6,6,5,5,5,5,5,5,5,5,4,5,5},
            {5,4,5,5,5,4,4,5,5,4,4,4,4,4,4,4,4,3,4,4,4,3,3,4,4,3,3,3},
            {6,6,6,7,6,6,6,6,5,6,6,6,5,5,6,6,5,5,5,6,5,5,5,5,4,5,5,5,5},
            {5,5,6,6,5,5,5,6,5,5,5,5,4,5,5,5,4,4,5,5,4,4,4,5,4,4,4,4,5},
            {6,6,6,7,6,6,6,6,5,6,6,6,5,5,6,6,5,5,5,6,5,5,5,5,4,5,5,5,5},
            {6,6,7,7,6,6,6,7,6,6,6,6,5,6,6,6,5,5,6,6,5,5,5,6,5,5,5,5,4,5,5,5,5},
            {7,8,8,8,7,7,8,8,7,7,7,8,7,7,7,7,6,7,7,7,6,6,7,7,6,6,6,7,7},
            {8,8,8,9,8,8,8,8,7,8,8,8,7,7,8,8,7,7,7,8,7,7,7,7,6,7,7,7,6,6,7,7,7},
            {8,8,8,9,8,8,8,8,7,8,8,8,7,7,8,8,7,7,7,8,7,7,7,7,6,7,7,7,7},
            {9,9,9,9,8,9,9,9,8,8,9,9,8,8,8,9,8,8,8,8,7,8,8,8,7,7,8,8,8},
            {8,8,8,8,7,8,8,8,7,7,8,8,7,7,7,8,7,7,7,7,6,7,7,7,6,6,7,7,7},
            {7,8,8,8,7,7,8,8,7,7,7,8,7,7,7,7,6,7,7,7,6,6,7,7,6,6,6,7,7}
    };
    private static char[][] sectionalTermYear = {
            {13,49,85,117,149,185,201,250,250},
            {13,45,81,117,149,185,201,250,250},
            {13,48,84,112,148,184,200,201,250},
            {13,45,76,108,140,172,200,201,250},
            {13,44,72,104,132,168,200,201,250},
            {5 ,33,68,96 ,124,152,188,200,201},
            {29,57,85,120,148,176,200,201,250},
            {13,48,76,104,132,168,196,200,201},
            {25,60,88,120,148,184,200,201,250},
            {16,44,76,108,144,172,200,201,250},
            {28,60,92,124,160,192,200,201,250},
            {17,53,85,124,156,188,200,201,250}
    };
    private static char[][] principleTermMap = {
            {21,21,21,21,21,20,21,21,21,20,20,21,21,20,20,20,20,20,20,20,20,19,
                    20,20,20,19,19,20},
            {20,19,19,20,20,19,19,19,19,19,19,19,19,18,19,19,19,18,18,19,19,18,
                    18,18,18,18,18,18},
            {21,21,21,22,21,21,21,21,20,21,21,21,20,20,21,21,20,20,20,21,20,20,
                    20,20,19,20,20,20,20},
            {20,21,21,21,20,20,21,21,20,20,20,21,20,20,20,20,19,20,20,20,19,19,
                    20,20,19,19,19,20,20},
            {21,22,22,22,21,21,22,22,21,21,21,22,21,21,21,21,20,21,21,21,20,20,
                    21,21,20,20,20,21,21},
            {22,22,22,22,21,22,22,22,21,21,22,22,21,21,21,22,21,21,21,21,20,21,
                    21,21,20,20,21,21,21},
            {23,23,24,24,23,23,23,24,23,23,23,23,22,23,23,23,22,22,23,23,22,22,
                    22,23,22,22,22,22,23},
            {23,24,24,24,23,23,24,24,23,23,23,24,23,23,23,23,22,23,23,23,22,22,
                    23,23,22,22,22,23,23},
            {23,24,24,24,23,23,24,24,23,23,23,24,23,23,23,23,22,23,23,23,22,22,
                    23,23,22,22,22,23,23},
            {24,24,24,24,23,24,24,24,23,23,24,24,23,23,23,24,23,23,23,23,22,23,
                    23,23,22,22,23,23,23},
            {23,23,23,23,22,23,23,23,22,22,23,23,22,22,22,23,22,22,22,22,21,22,
                    22,22,21,21,22,22,22},
            {22,22,23,23,22,22,22,23,22,22,22,22,21,22,22,22,21,21,22,22,21,21,
                    21,22,21,21,21,21,22}
    };
    private static char[][] principleTermYear = {
            {13,45,81,113,149,185,201},
            {21,57,93,125,161,193,201},
            {21,56,88,120,152,188,200,201},
            {21,49,81,116,144,176,200,201},
            {17,49,77,112,140,168,200,201},
            {28,60,88,116,148,180,200,201},
            {25,53,84,112,144,172,200,201},
            {29,57,89,120,148,180,200,201},
            {17,45,73,108,140,168,200,201},
            {28,60,92,124,160,192,200,201},
            {16,44,80,112,148,180,200,201},
            {17,53,88,120,156,188,200,201}
    };
    public int computeSolarTerms() {
        if (gregorianYear<1901 || gregorianYear>2100) return 1;
        sectionalTerm = sectionalTerm(gregorianYear, gregorianMonth);
        principleTerm = principleTerm(gregorianYear, gregorianMonth);
        return 0;
    }
    public static int sectionalTerm(int y, int m) {
        if (y<1901 || y>2100) return 0;
        int index = 0;
        int ry = y-baseYear+1;
        while (ry>=sectionalTermYear[m-1][index]) index++;
        int term = sectionalTermMap[m-1][4*index+ry%4];
        if ((ry == 121)&&(m == 4)) term = 5;
        if ((ry == 132)&&(m == 4)) term = 5;
        if ((ry == 194)&&(m == 6)) term = 6;
        return term;
    }
    public static int principleTerm(int y, int m) {
        if (y<1901 || y>2100) return 0;
        int index = 0;
        int ry = y-baseYear+1;
        while (ry>=principleTermYear[m-1][index]) index++;
        int term = principleTermMap[m-1][4*index+ry%4];
        if ((ry == 171)&&(m == 3)) term = 21;
        if ((ry == 181)&&(m == 5)) term = 21;
        return term;
    }
    public String toString() {
        StringBuffer buf = new StringBuffer();
        buf.append("Gregorian Year: "+gregorianYear+"\n");
        buf.append("Gregorian Month: "+gregorianMonth+"\n");
        buf.append("Gregorian Date: "+gregorianDate+"\n");
        buf.append("Is Leap Year: "+isGregorianLeap+"\n");
        buf.append("Day of Year: "+dayOfYear+"\n");
        buf.append("Day of Week: "+dayOfWeek+"\n");
        buf.append("Chinese Year: "+chineseYear+"\n");
        buf.append("Heavenly Stem: "+((chineseYear-1)%10)+"\n");
        buf.append("Earthly Branch: "+((chineseYear-1)%12)+"\n");
        buf.append("Chinese Month: "+chineseMonth+"\n");
        buf.append("Chinese Date: "+chineseDate+"\n");
        buf.append("Sectional Term: "+sectionalTerm+"\n");
        buf.append("Principle Term: "+principleTerm+"\n");
        if (gregorianDate==sectionalTerm) {
            String str = sectionalTermNames[(gregorianMonth-2+12)%12];
            if("清明".equals(str)){
                buf.append("jieqi : true\n");
            }
        }else{
            buf.append("jieqi : false\n");
        }
        return buf.toString();
    }
    //获取中国的农历时间
    public String getChineseDate(){
        StringBuffer buf = new StringBuffer();
        if(chineseMonth<0){
            buf.append("*"+(0-chineseMonth));
        }else{
            if (chineseMonth<10){
                buf.append("0"+chineseMonth);
            }else{
                buf.append(chineseMonth);
            }
        }
        if (chineseDate<10){
            buf.append("0"+chineseDate);
        }else{
            buf.append(chineseDate);
        }
        return buf.toString();
    }
    //判断这天是否是清明节
    public boolean isQingming(){
        if (gregorianDate==sectionalTerm) {
            String str = sectionalTermNames[(gregorianMonth-2+12)%12];
            if("清明".equals(str)){
                return true;
            }
        }
        return false;
    }
    public String[] getYearTable() {
        setGregorian(gregorianYear,1,1);
        computeChineseFields();
        computeSolarTerms();
        String[] table = new String[58]; // 6*9 + 4
        table[0] = getTextLine(27, "公历年历："+gregorianYear);
        table[1] = getTextLine(27, "农历年历："+(chineseYear+1)
                + " ("+stemNames[(chineseYear+1-1)%10]
                + branchNames[(chineseYear+1-1)%12]
                + " - "+animalNames[(chineseYear+1-1)%12]+"年)");
        int ln = 2;
        String blank  = "                                         "
                +"  " + "                                         ";
        String[] mLeft = null;
        String[] mRight = null;
        for (int i=1; i<=6; i++) {
            table[ln] = blank;
            ln++;
            mLeft = getMonthTable();
            mRight = getMonthTable();
            for (int j=0; j<mLeft.length; j++) {
                String line = mLeft[j] + "  " + mRight[j];
                table[ln] = line;
                ln++;
            }
        }
        table[ln] = blank;
        ln++;
        table[ln] = getTextLine(0,
                "##/## - 公历日期/农历日期，(*)#月 - (闰)农历月第一天");
        ln++;
        return table;
    }
    public static String getTextLine(int s, String t) {
        String str  = "                                         "
                +"  " + "                                         ";
        if (t!=null && s<str.length() && s+t.length()<str.length())
            str = str.substring(0,s) + t + str.substring(s+t.length());
        return str;
    }
    private static String[] monthNames =
            {"一","二","三","四","五","六","七","八","九","十","十一","十二"};
    public String[] getMonthTable() {
        setGregorian(gregorianYear,gregorianMonth,1);
        computeChineseFields();
        computeSolarTerms();
        String[] table = new String[8];
        String title  = null;
        if (gregorianMonth<11) title  = "                   ";
        else title  = "                 ";
        title = title + monthNames[gregorianMonth-1] + "月"
                + "                   ";
        String header = "   日    一    二    三    四    五    六 ";
        String blank  = "                                          ";
        table[0] = title;
        table[1] = header;
        int wk = 2;
        String line = "";
        for (int i=1; i<dayOfWeek; i++) {
            line += "     " + ' ';
        }
        int days = daysInGregorianMonth(gregorianYear,gregorianMonth);
        for (int i=gregorianDate; i<=days; i++) {
            line += getDateString() + ' ';
            rollUpOneDay();
            if (dayOfWeek==1) {
                table[wk] = line;
                line = "";
                wk++;
            }
        }
        for (int i=dayOfWeek; i<=7; i++) {
            line += "     " + ' ';
        }
        table[wk] = line;
        for (int i=wk+1; i<table.length; i++) {
            table[i] = blank;
        }
        for (int i=0; i<table.length; i++) {
            table[i] = table[i].substring(0,table[i].length()-1);
        }

        return table;
    }
    private static String[] chineseMonthNames =
            {"正","二","三","四","五","六","七","八","九","十","冬","腊"};
    private static String[] principleTermNames =
            {"雨水","春分","谷雨","夏满","夏至","大暑","处暑","秋分","霜降",
                    "小雪","冬至","大寒"};
    private static String[] sectionalTermNames =
            {"立春","惊蛰","清明","立夏","芒种","小暑","立秋","白露","寒露",
                    "立冬","大雪","小寒"};
    public String getDateString() {
        String str = "*  /  ";
        String gm = String.valueOf(gregorianMonth);
        if (gm.length()==1) gm = ' ' + gm;
        String cm = String.valueOf(Math.abs(chineseMonth));
        if (cm.length()==1) cm = ' ' + cm;
        String gd = String.valueOf(gregorianDate);
        if (gd.length()==1) gd = ' ' + gd;
        String cd = String.valueOf(chineseDate);
        if (cd.length()==1) cd = ' ' + cd;
        if (gregorianDate==sectionalTerm) {
            str = " "+sectionalTermNames[(gregorianMonth-2+12)%12];
        } else if (gregorianDate==principleTerm) {
            str = " "+principleTermNames[(gregorianMonth-2+12)%12];
        } else if (chineseDate==1 && chineseMonth>0) {
            str = " "+chineseMonthNames[chineseMonth-1]+"月";
        } else if (chineseDate==1 && chineseMonth<0) {
            str = "*"+chineseMonthNames[-chineseMonth-1]+"月";
        } else {
            str = gd+'/'+cd;
        }
        return str;
    }
    public int rollUpOneDay() {
        dayOfWeek = dayOfWeek%7 + 1;
        dayOfYear++;
        gregorianDate++;
        int days = daysInGregorianMonth(gregorianYear,gregorianMonth);
        if (gregorianDate>days) {
            gregorianDate = 1;
            gregorianMonth++;
            if (gregorianMonth>12) {
                gregorianMonth = 1;
                gregorianYear++;
                dayOfYear = 1;
                isGregorianLeap = isGregorianLeapYear(gregorianYear);
            }
            sectionalTerm = sectionalTerm(gregorianYear,gregorianMonth);
            principleTerm = principleTerm(gregorianYear,gregorianMonth);
        }
        chineseDate++;
        days = daysInChineseMonth(chineseYear,chineseMonth);
        if (chineseDate>days) {
            chineseDate = 1;
            chineseMonth = nextChineseMonth(chineseYear,chineseMonth);
            if (chineseMonth==1) chineseYear++;
        }
        return 0;
    }

}
